Users manual
FA845
version 1.5
Envionic
21
Chapter 3 RF SCAN mode
3.1 Spectrum analyzer introduction
The spectrum analyzer in the FA845 measures only a single frequency at a time, but it can scan
through a range of frequencies (with a speed of 100 frequencies per second, for instance).
It starts scanning at the START frequency and stops at the STOP frequency. The values of the
start and stop frequencies are, of course, under control of the user.
The scanning speed is automatically selected by the device, based on the SPAN (difference
between start and stop) and the RBW (resolution bandwidth).
For the spectrum analyzer, you need the same antenna set-up as described in the previous
chapter (chapter 2).
To make the spectrum analyzer easy to use, it has been given two major operating modes:
1) SCAN (described in this chapter):
In the SCAN mode, the user selects the frequency band that he wants to measure. It is selected
from a fixed list of bands. The START and STOP frequency are then set automatically
according to the selected band. You can also define your own bands on the micro-SD card
(described at the end of this chapter).
2) EXPERT mode (described in the next chapter)
In the Expert mode, the user has full control over the spectrum analyzer. He can set START
and STOP frequencies, or the center frequency and SPAN, and the resolution bandwidth. This
can be slightly more difficult to use than the SCAN mode, but it gives more possibilities.
To switch from SCAN mode to EXPERT mode, select "Disp" with button 4 and then use
button 2 ("Xprt").
The SCAN and EXPERT modes are not also suitable to measure pulsed signals (like DECT).
When the signal is pulsed, the shown strength is the strength at the top of the pulse.
